Saute the onions in a pot in a little bit of oil until slightly browned.,Add the carrot, celery, and garlic and 6 cups of vegetable broth.,Bring to the boil and then simmer for 30 minutes.,______,Strain the veggies from the broth and add the mushrooms and scallions before serving.,Serve with soy sauce and sriracha sauce to add for additional flavor.